Two plane mirrors are inclined at an angle θ. A ray of light is reflected from the first mirror and is then incident on the second mirror from which it is again reflected. What is deviation of incident ray?

 A mirror with a flat surface is a plane mirror that reflects light and produces a virtual image without the interference of an inward or outward curve is called a plane mirror.


As per the figure 

Let us assume the two incident angles



We observe that

Total deviation is 2(90−x)+2(90−y)


The deviation of incident ray =360−2θ

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